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Hyperthyroidism I: Introduction

Hyperthyroidism I: Introduction

Hyperthyroidism is a type of thyrotoxicosis characterized by the thyroid gland's overproduction of the thyroid hormones triiodothyronine (T3) and thyroxine (T4). This hormone excess increases the basal metabolic rate and enhances sensitivity to catecholamines.DiagnosisDiagnosis is based on clinical features and biochemical testing. It typically shows suppressed thyroid-stimulating hormone (TSH) levels below 0.4 mIU/L, with elevated free T3 and/or T4. Additional tests, including thyroid...

Hyperthyroidism II: Pathophysiology

Hyperthyroidism II: Pathophysiology

Hyperthyroidism is a hypermetabolic state caused by elevated levels of thyroid hormones, triiodothyronine (T3) and thyroxine (T4). It results from dysregulation at the thyroid, pituitary, or immune system level and affects multiple organ systems.PathophysiologyThe most common cause of hyperthyroidism is Graves’ disease, an autoimmune disorder in which antibodies, specifically thyroid-stimulating antibodies (TSAb), a subtype of TSH receptor antibodies (TRAb), bind to and activate TSH receptors...

Graves Disease II: Pathophysiology

Graves Disease II: Pathophysiology

Graves’ disease is an autoimmune disorder characterized by the production of thyroid-stimulating immunoglobulins (TSI) that activate TSH receptors, leading to excessive synthesis and release of thyroid hormones (T3 and T4) and resulting in hyperthyroidism.Among all causes of hyperthyroidism, Graves’ disease is the most common and can happen at any age, though it is more frequent in women. It produces a hypermetabolic state with features such as weight loss, tachycardia, tremor, and heat...

Synthesis and Regulation of Thyroid Hormones

Synthesis and Regulation of Thyroid Hormones

Low blood levels of the thyroid hormones — triiodothyronine (T3) and thyroxine (T4) — signal the hypothalamus to release the thyrotropin-releasing hormone (TRH). TRH then reaches the pituitary gland and stimulates the release of thyroid-stimulating hormone(TSH) into the bloodstream.
Upon reaching the thyroid gland, TSH stimulates the follicular cells' active uptake of iodide ions from the blood. The ions diffuse to the apical surface of the cells and are oxidized to iodine. The iodine is then...

Graves' Disease I: Introduction

Graves' Disease I: Introduction

Graves' disease is an autoimmune disorder that causes hyperthyroidism, or overactivity of the thyroid gland. It results from autoantibodies called thyroid-stimulating immunoglobulins (TSIs), which bind to thyroid-stimulating hormone (TSH) receptors, leading to overstimulation of hormone production and a hypermetabolic state.EtiologyAlthough considered idiopathic, Graves’ disease has well-established contributing factors. There is a strong genetic component, with increased prevalence in...

Goiter

Goiter

Goiter refers to an abnormal enlargement of the thyroid gland that may appear as a diffuse goiter (uniform enlargement) or nodular (single or multiple nodules). Functionally, it is classified as nontoxic (normal/low hormone levels) or toxic (excess hormone production).PathophysiologyDiffuse thyroid enlargement typically results from prolonged stimulation by thyroid-stimulating hormone (TSH) or TSH-like agents, commonly seen in hypothyroidism or iodine deficiency. In contrast, in hyperthyroid...

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Related Experiment Video

Updated: May 29, 2026

Transoral Endoscopic Thyroidectomy Vestibular Approach for Thyroid Lobectomy

Transoral Endoscopic Thyroidectomy Vestibular Approach for Thyroid Lobectomy

Published on: May 12, 2023

Primary thyroid lymphoma with elevated free thyroxine level.

N Yahaya¹, S W Din, M Z Ghazali

¹Endocrine Unit, Department of Medicine, Hospital Universiti Sains Malaysia, Kubang Kerian 16100, Malaysia. jaiyati@yahoo.com

Singapore Medical Journal

|September 28, 2011

Summary

This summary is machine-generated.

Primary thyroid lymphoma, often linked to Hashimoto thyroiditis, rarely causes hyperthyroidism. This case highlights a patient with severe thyrotoxicosis despite minimal symptoms, challenging typical presentations of thyroid cancer.

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Area of Science:

Endocrinology
Oncology
Immunology

Background:

Primary thyroid lymphoma (PTL) is a rare malignancy associated with Hashimoto thyroiditis.
Elevated antithyroglobulin and antimicrosomal antibodies are found in up to 95% of PTL patients.
PTL typically presents as a rapidly enlarging neck mass with compressive symptoms.

Observation:

Most patients with PTL have normal thyroid hormone levels and lack clinical hyperthyroidism.
This report details a patient with PTL exhibiting minimal clinical signs of thyrotoxicosis.
The patient presented with markedly elevated serum free thyroxine and suppressed serum thyroid-stimulating hormone.

Findings:

The study highlights a rare presentation of primary thyroid lymphoma.
It demonstrates that PTL can occur with significant thyrotoxicosis despite subtle clinical manifestations.
This challenges the conventional understanding of thyroid hormone levels in PTL.

Implications:

Clinicians should consider PTL in patients with unexplained thyrotoxicosis, even with minimal symptoms.
This case broadens the clinical spectrum of primary thyroid lymphoma presentations.
Further research may elucidate the mechanisms behind thyroid dysfunction in PTL.